Bradycardia compositions

ABSTRACT

BRADYCARDIA COMPOSITIONS HAVING N - ISOPROPYL-NORADRENALINE ANTAGONISTIC ACTIVITY AND METHOD OF INDUCING SAID ACTIVITY IN WARM-BLOODED ANIMALS USING AS THE ACTIVE INGREDIENT AT LEAST ONE 1-SUBSTITUTED PHENOXY-2-HYDROXY3-N-ISOPROPYLAMINO PROPANE OF THE FORMULA   (R,R1,R2-PHENYL)-O-CH2-CH(-OH)-CH2-NH-CH(-CH3)2   WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, HALOGEN, ALKYL OF 1 TO 4 CARBON ATOMS, ALKOXY OF 1 TO 4 CARBON ATOMS, HYDROXYALKYL OF 1 TO 4 CARBON ATOMS, HYDROXYCARBONYL, ALKOXYCARBONYL OF 1 TO 4 CARBON ATOMS, ALKENYL OF 2 TO 4 CARBON ATOMS, ALKYNYL OF 2 TO 4 CARBON ATOMS, ALKYLTHIO OF 1 TO 4 CARBON ATOMS AND CYANO, R1 IS -(CH2)X-NH2 WHERE X IS AN INTEGER FROM 0 TO 3 AND R2 IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, HALOGEN, ALKYL OF 1 TO 4 CARBON ATOMS AND ALKOXY OF 1 TO 4 CARBON ATOMS, EITHER AS A RACEMATE OR AN OPTICALLY ACTIVE ISOMER, OR ITS NONTOXIC PHARMACEUTICALLY ACCEPTABLE ACID ADDITION SALT.

United States Patent Office 3,740,443 Patented June 19, 1973 3,740,443 BRADYCARDIA COMPOSITIONS Herbert Koppe, Ingelheim, Albrecht Engelhardt, Mainz,

Gerhard Ludwig, Lippramsdorf, and Karl Zeile, Ingelheirn, Germany, assignors to Boehringer ingelheim G.rn.b.l l., llngelheim am Rhine, Germany No Drawing. Continuation-impart of application er. No. 821,137, May 1 1969 now Patent No. $644,636, which is a continuation-in-part of application Ser. No. 619,141, Feb. 28, 1967, now Patent No. 3,459,782, which in turn is a continuation-in-part of abandoned application Ser. No. 391,012, Aug. 20, 1964. This application Feb. 22, 1971, Ser. No. 117,773.

Claims priority, application Germany, Aug. 26, 1963, B 73,262; June 24, 1966, R 87,767; Dec. 30, 1966, B 90,543; and Feb. 6, 1967, B 91,070

lnt. Cl. A611: 27/00 U.S. Cl. 424330 12 Olaims ABSTRACT OF THE DESCLOSURE Bradycardia compositions having N isopropyl-noradrenaline antagonistic activity and method of inducing said activity in warm-blooded animals using as the active ingredient at least one l-substituted phenoxy-Z-hydroxy- 3-N-isopropylamino propane of the formula wherein R is selected from the group consisting of hydrogen, halogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, hydroxyalkyl of 1 to 4 carbon atoms, hydroxycarbonyl, alkoxycarbonyl of 1 to 4 carbon atoms, alkenyl of 2 to 4 carbon atoms, alkynyl of 2 to 4 carbon atoms, alkylthio of 1 to 4 carbon atoms and cyano, R is (CH -NH where x is an integer from to 3 and R is selected from the group consisting of hydrogen, halogen, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, either as a racemate or an optically active isomer, or its nontoxic, pharmaceutically acceptable acid addition salt.

PRIOR APPLICATIONS The present application is a continuation-in-part application of our copending patent application Ser. No. 821,137 filed May 1, 1969, now U.S. Pat. No. 3,644,636 which in turn is a continuation-in-part application of patent application Ser. No. 619,141 filed Feb. 28, 1967 and now U.S. Pat. No. 3,459,782 which in turn is a continuation-in-part application of copending, commonly assigned U.S. patent application Ser. No. 391,012 filed Aug. 20, 1964 now abandoned.

OBJECTS OF THE INVENTION It is an object of the invention to provide novel compositions having bradycardia activity.

It is another object of the invention to provide a novel method of inducing bradycardia and suppressing the tachycardiac effects of N-isopropyl-noradrenaline in warm-blooded animals.

These and other objects and advantages of the invention will become obvious from the following detailed description.

THE INVENTION The present invention relates to bradycardia compositions comprising an eifective amount of at least one compound selected from the group consisting of racemic 1- substituted phenoxy 2 hydroXy-3-isopropyl amino-propanes of a formula selected from the group consisting of 0 OH (Ia) wherein R is selected from the group consisting of hydrogen, halogen, alkyl and alkoxy of 1 to 4 carbon atoms, hydroxyalkyl of 1 to 4 carbon atoms, hydroxycarbonyl, alkoxycarbonyl of 1 to 4 carbon atoms, alkenyl and alkynyl of 2 to 4 carbon atoms, alkylthio of 1 to 4 carbon atoms and cyano, R is selected from the group consisting of (CH CN and -(CH NH x is an integer from 0 to 3 and R is selected from the group consisting of hydrogen, halogen and alkyl or alkoxy of 1 to 4 carbon atoms, their optically active isomers and nontoxic, pharmaceutically acceptable acid addition salts of said racemates and of said optically active isomers and a major amount of a pharmaceutical carrier.

The compounds according to the present invention may be prepared by a number of different methods in volving known chemical reaction principles; however, among these, the following methods have been found to be most convenient and efficient:

METHOD A By reacting an epoxide of the formula OCH2- O H/ 0 Hz R1 O 0 CH2 O-CHz- (lg-7GB:

where the Rs have the same meanings as in Formula I, with isopropylamine in the presence of an inert solvent, such as ethanol.

METHOD B By reacting a l-substituted phenoXy-2-hydroxy-3-halo propane of the formula wherein the Rs have the same meanings as in Formula I and Hal is halogen, with isopropylamine in the presence of an inert solvent, such as ethanol.

METHOD C By reacting a 1 substituted phenoxy 2 hydroxy 3- amino-propane of the formula wherein the Rs have the same meanings as in Formula I, with an isopropyl halide.

METHOD D By hydrolizing an oxazolidinone of the formula -OGH;CHOHZ R1 6 l t-(intern),

0 oh, OOHzOH-CH o l) I I-CH(GHs)z o (5 (Va) wherein the Rs have the same meanings as in Formula 1.

METHOD E By reacting a substituted phenolate of the formula.

0 or. Doc

o (V'Ia) wherein the Rs have the same meanings as in Formula I and M is a monovalent cation, preferably an alkali metal,

with a 1-halo-2-hydroxy-3-isopropylamino-propane.

METHOD F By hydrogenating a l-substituted phenoxy-Z-hydroxy- 3-benzylisopropylamino-propane of the formula R /CH -C H O-CHziH-CH N\ H 011(011), R, 3 (VII) o CHz-CGHE on, Q-m-om-on-om-nk \O OH CH(CH3)2 (VIIa) wherein the Rs have the same meanings as in Formula 1.

METHOD G By reducing a ketone of the formula wherein the Rs have the same meanings as in Formula I, with catalytically activated hydrogen or a boranate, such as aluminum boranate.

The starting compounds of the Formulas II to VIII and 11a to VIIIa for the above methods are known compounds or may readily be prepared by known methods. For

example, the substituted 1-phenoxy-2,3-epoxy propanes of Formula II may be prepared by reacting a corresponding substituted phenol under alkaline conditions with a lhalo-2,3-epoxy-propane such as epichlorohydrin. Most of the corresponding phenols are known in the prior art and they are easily obtainable by conventional methods. Cyanophenols, particularly those with alkyl and/0r alkoxy groups, may be prepared by splitting off water from the correspondingly substituted phenolic benzaldoximes, which are prepared from known phenolic benzaldehydes. Cyanophenols with an allyl substituent are obtained by reacting the cyanophenol with allyl bromide with rearrangement of the intermediate allyl ether into the final product. Halocyanophenols are obtained by reacting the cyanophenol with a hydrogen halide in the presence of H 0 Cyanomethylphenols can be made by introducing a nitro group into a benzylnitrile and converting it into a phenol group by reducing, diazotizing, and boiling down. The aminomethylphenols are prepared by reduction of the corresponding cyanomethylphenol. Other processes are described in Belgian Pat. No. 641,133, British Pat. No. 894,189 and in the literature.

The free bases of the Formulas I and Ia obtained by any of the above methods, A through G, may subsequently be transformed into nontoxic, pharmacologically acceptable acid addition salts by conventional methods, that is, by acidifying a solution of the free base with the desired acid and recovering the acid addition salt by evaporation of the solvent or by precipitation, for instance.

Examples of non-toxic, pharmacologically acceptable acid addition salts of the bases are those formed with hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, methane sulfonic acid, acetic acid, lactic acid, tartaric acid, ascorbic acid, 8-chlorotheophylline and the like.

The following examples further illustrate the present invention and will enable others skilled in the art to understand it more completely. It should be understood, however, that our invention is not limited to the specific examples given below.

EXAMPLE I Preparation of 1-(2-methoxy-4-cyanophenoxy)-2- hydroxy-3isopropylarnino-propane.HCl

15.4 g. (0.075 mol) of 1-(2-methoxy-4-cyanophenoxy)-2,3-epoxy-propane were dissolved in m1. of ethanol and after 17.7 g. (0.3 mol) of isopropylamine were added, the mixture was heated to 5060 C. for one hour. Then it was heated for two hours under reflux and the solvent was distilled off (in vacuo) and the residue was mixed with ether. After addition of dilute hydrochloric acid, it was shaken vigorously and the aqueous phase was separated and made alkaline with NaOH. The precipitating oily base was taken up in ether and the ethereal phase was separated, washed with water and dried over MgSO Then, the ether was distilled off and the solid residue recrystallized from ethylacetate/ petroleum ether. The thus purified free base was dissolved in ethanol, ethereal HCl added and the precipitate was sucked off to obtain 8.2 g. (37% of theory) of 1-(2- methoxy-4-cyanophenoxy)-2 hydroxy-3-isopropylaminopropane hydrochloride having a melting point of 137 C.

EXAMPLE II Preparation of 1-(2-methoxy-5-cyanophenoxy)-2- hydroxy-3-isopropylamino-propane.HCl

20 g. (0.1 mol) of 1-(Z-methoxy-S-cyanophenoxy)- 2,3-epoxy-propane were dissolved in ml. of methanol and after 17.7g. (0.3 mol) of isopropylamine were added and after standing for one hour at room temperature, the mixture was heated under reflux. Then the solvent was distilled off in vacuo, the residue was digested with dilute HCl and the not completely clear of theory) of 1-(2-methoxy-S-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane hydrochloride having a melting point of 127 to 130 C.

EXAMPLE III Preparation of 1-(2-methoxy-6-cyanophenoxy)-2- hydroxy-3-isopropylamino-propane.HCl

Using the process of Example I, 19.5 g. (0.095 mol) of l-(2-methoxy-6-cyanophenoxy)-2,3-epoxypropane in methanol were reacted with 17.7 g. (0.3 mol) of isopropylamine. By dissolution of the purified, solid base in ethanol, after addition of ethereal HCl, 14.4 g. (50% of theory) of crystalline 1-(2-methoxy-6-cyanophenoxy)- 2-hydroxy-3-isopropylamino-propane hydrochloride having a melting point of 148-15 1 C. were obtained.

EXAMPLE 1V Preparation of 1-(2-cyano-5-methoxyphenoxy)-2- hydroxy-3-isopropylamino-propane.HCl

Using the process of Example II, 17.5 g. (0.088 mol) of l-(2-cyano-5-methoxy)-2,3-epoxypropane in 100 ml. of methanol were reacted with isopropylamine. 9.5 g. of the recrystallized free solid base having a melting point of 71 to 73 C. were dissolved in ethanol, mixed with ethereal hydrochloric acid to obtain 9.8 g. (38% of theory) of purely white 1-(2-cyano-5-methoxyphenoxy)- 2-hydroxy-3-isopropylamino-propane hydrochloride hav ing a melting point of 147149 C.

EXAMPLE V Preparation of 1-(2-allyl-4-cyanophenoxy)-2- hydroxy-3-isopropylamino-propane.HCl

16 g. (0.0745 mol) of 1-(2-allyl-4-cyanophenoxy)-2, 3-epoxypropane were reacted with isopropylamine in ethanol using the procedure of Example II. The purified base (13 g.) having a melting point of 9294 C. Was dissolved in ethanol and acidified with ethereal HCl to obtain 12.5 g. of 1-(2-allyl-4-cyanophenoxy)-2-hydroxy- 3-isopropylamino propane hydrochloride (54% of theory) having a melting point of 140-142.

EXAMPLE VI Preparation of 1-(4-cyanomethylphenoxy)-2-hydroxy- 3-isopropylamino-propane.HCl

21.2 g. (0.112 mol) of 1-(4-cyanomethylphenoxy)-2,3- epoxy-propane were reacted in methanol with is0propylamine using the procedure of Example II. The solid base (22.2 g.) was mixed in ethanol with ethereal HCl to obtain l-(4 cyanomethylphenoxy)-2-hydroxy-3-isopropylamino-propane hydrochloride having a melting point of 155158 C.

EXAMPLE VII Preparation of 1-(Z-cyanomethylphenoxy)-2-hydroxy- 3-isopropylamino-propane.HCl

7.8 g. (0.041 mol) of 1-(Z-cyanomethylphenoxy)-2,3- epoxy-propane were reacted with isopropylamine in ethanol using the procedure of Example 11. The isolated solid base (7.0 g.) was dissolved in ethanol and 1-(2-cyan0- methylphenoXy)2-hydroxy 3 isopropylamino-propane hydrochloride was precipitated with ethereal hydrochloric acid. Its melting point was 1l9l21 C.

6 EXAMPLE vnr Preparation of 1-(2-amino-5-methoxyphenoxy)-2- hydroxy-3-isopropylamino-propane.2HC1

5.68 g. (0.02 mol) of 1(2-nitro-5-methoxyphenoxy)- 2-hydroxy-3-isopropylamino-propane were dissolved in 200 ml. of methanol and hydrogenated at room temperature over Raney-nickel. After sucking otlt' the catalyst, the clear solution was evaporated in vacuo, whereby 5.6 g. of basic residue was obtained. The residue was dissolved in ethanol, mixed with ethereal HCl and the resulting crystalline 1-(2-amino 5 methoxyphenoxy)-2-hydroxy- 3-isopropylamino-propane dihydrochloride was isolated. It was recrystallized from ethanol under addition of ether to obtain 3.5 g. (53% of theory) having a melting point of 223-225 C.

EXAMPLE 1X Preparation of 1-(3-cyano-4-chlorophenoxy)2-hydroxy- 3-isopropylamino-propane.HCl

9.36 g. (0.04 mol) of I-(S-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane were dissolved in 64 ml. of concentrated HCl and after 4.5 g. of H 0 of 30% were dropped into it, the mixture was heated to 60 C. When the temperature had reached 65 C., it was stirred for 30 minutes at this temperature. Then, the cooled down batch was made alkaline with NaOH. The precipitated base was extracted with ether and the ethereal phase was separated, washed with water and dried over MgSO After the ether was evaporated, a solid basic residue remained, which was recrystallized from ethylacetate with addition of petroleum ether to obtain 4.5 g. of 1-(3-cyano-4-chlorophenoxy)-2-hydroxy-3-isopropylamino-propane having a melting point of 118122 C. The said base was dissolved in ethanol and mixed with ethereal HCl whereby the crystalline hydrochloride precipitated. After filtering and drying, 2.9 g. (24% of theory) of the product having a melting point of l75177 C. were obtained.

EXAMPLE X Preparation of 1-(2-cyano-4-chlorophenoxy)-2-hydroxy- 3-1sopropylamino-propane.HCl

3.51 g. (0.015 mol) of 1-(2-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane were chlorinated and processed in HCl/H O as in Example IX. The isolated base (2.2 g.) melted at 9l-94 C. It was dissolved in ethanol and mixed with ethereal HCl to obtain 2.3 g. (48% of theory) colourless crystals of 1-(2-cyano-4-chlorophenoxy)-2-hydroxy-3-isopropylamino-propane hydrochloride having a melting point of 1 67168 C.

EXAMPLE XI Preparation of 1-(3-cyano-4-bromophenoxy)-2-hydroxy- 3-isopropylamino-propane.HCl

7.02 g. (0.03 mol) of 1-(3-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane were dissolved in 50 m1. of 50% HBr and heated to 45 C. 3.4 g. (0.03 mol) of 30% H 0 were stirred in slowly, whereby the temperature rose to approximately 70 C. When the addition was finished, the mixture was heated to 60 C. for an hour. Then, water was added and the mixture was made alkaline with NaOH. The base was shaken with ether and the ethereal phase was separated, washed with water, dried with MgSO and the ether was distilled oif. The solid residue was recrystallized from ethyl acetate with addition of petroleum ether to obtain 2.8 g. of 1-(3-cyano-4- bromophenoxy) 2 hydroxy-3-isopropylamino-pr0pane having a melting point of 120128 C. The said base was dissolved in ethanol, mixed with ethereal I-ICl and the separated crystal was filtered to obtain 3.9 g. (37% of theory) of the corresponding hydrochloride having a melting point of 194-196 C.

7 EXAMPLE x11 Preparation of 1- (2-cyano-4-bromophenoxy)-2-hydroxy 3-isopropylamino-propane.HCl

Using the procedure of Example XI, 2.34 g. (0.01 mol) of 1-(2-cyanophenoxy) 2 hydroxy-3-isopropylaminopropane were brominated with HBr/H O to obtain 1.5 g. of l-(2-cyano-4-bromophenoxy) 2 hydroxy-3-isopropylamino-propane having a melting point of 9293 C. The base dissolved in ethanol was treated with ethereal HCl to obtain 1.5 g. (43% of theory) of the corresponding hydrochloride having a melting point of 167 to 169 C.

EXAMPLE XIII Preparation of 1-(4-aminomethylphenoxy)-2-hydroxy- 3-isopropylaminopropane.2HCl

22.2 g. (0.095 mol) of 1-(4-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane were dissolved in 200 ml. of methanol. Ammonia was added thereto and the mixture was hydrogenated over Raney-nickel at a hydrogen pressure of 21 atmospheres at 20 C. After filtering off the catalyst, the solvent was distilled off in vacuo and the oily residue was dissolved in ethanol and acidified with alcoholic HCl. The solution was filtered hot and then cooled to obtain 18.1 g. (61.5% of theory) of 1-(4-aminomethylphenoxy)-2-hydroxy-3-isopropylamino-propane di hydrochloride in the form of colorless crystals having a melting point of 241 to 244 C.

EXAMPLE XIV Preparation of 1-(3-aminomethylphenoxy)-2-hydroxy-3- isopropylamino-propane.ZI-IBr 13 g. (0.055 mol) of l-(3-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane were hydrogenated and worked up as in Example XIII. The basic residue was dissolved in isopropanol and treated with HBr and filtered to obtain 12.5 g. (57% of theory) of colorless 1-(3-aminomethylphenoxy) 2 hydroxy-3-isopropylamino-propane dihydrobromide having a melting point of 178 to 181 C.

EXAMPLE XV Preparation of 1- 2-chloro-5-aminophenoxy -2-hydroxy- 3-isopropylamino-propane.2I-IC1 Using the process of Example VIII, 1-(2-chloro-5-nitrophenoxy) 2 hydroxy 3 isopropylamino-propane was hydrogenated and worked up to obtain 1 (2 chloro S-arninophenoxy) 2 hydroxy 3 isopropylaminopropane dihydrochloride having a melting point of 175- 178 C.

EXAMPLE XVI Preparation of l- (2-allyl-6-cyanophenoxy)-2-hydroxy-3- isopropylamino-propane Using the procedure of Example 11, l-(2-allyl-6cyanophenoxy)-2,3-epoxy-propane was reacted with isopropylamine toobtain 1 (2 allyl-6-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane having a melting point of 52 to 54 C.

EXAMPLE XVII Preparation of l- 2-allyl-5-cyanophenoxy) -2-hydroxy-3- isopropylamino-propaneHCl Using the procedure of Example II, 1-(2-a1lyl-5-cyanophenoxy)2,3-epoxypropane was reacted with isopropylamine to obtain 1 (2 allyl-S-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane hydrochloride having a melting point of 150-152 C.

EMMPLE XVIII Preparation of 1-(4-aminophenoxy)-2-hydroxy-3-isopropylarnino-propane.2HCl

Using the procedure of Example VIII, l-(4-nitrophenoxy) 2 hydroxy 3 isopropylarnino-propane Was reacted with (Raney-nickel/H isopropylamine to ob- 8 tain 1 (4 aminophenoxy) 2 hydroxy 3-isopropylamino-propane dihydrochloride having a melting point of 24024l C.

EXAMPLE XIX Preparation of 1- 3,4-methylenedioxyphenoxy -2-hydroxy-3-isopropylamino-propane.HCl

0.1 mol of 1 (3,4-methylenedioxyphenoxy)-3-chloropropanol-2 was dissolved in 75 cc. of ethanol and 0.3 mol of isopropylamine were added to the solution. After the exothermic reaction had subsided, the reaction mixture was allowed to stand overnight at room temperature after which it was heated at 60 C. for 3 hours. The ethanol was distilled off in vacuo and the residue was worked up to obtain 1 (3,4 methylenedioxyphenoxy)- 2-hydroxy-3-isopropylamino-propane. The free base was then converted into its hydrochloride, which had a melting point of 127127.5 C.

EXAMPLE XX Preparation of 1-(Z-aminophenoxy)-2-hydroxy-3-isopropylamino-propane.2HCl

Using the procedure of Example VIII, 1-(2-aminophenoxy) 2 hydroxy 3 isopropylarnino-propane was prepared from 1 (2 nitrophenoxy) 2 hydroxy- 3 isopropylamino propane. Its dihydrochloride had a melting point of 2l62l9 C.

EXAMPLE XXI Preparation of l-(3-aminophenoxy)-2-hydroxy-3- isopropylamino-propane Using the procedure of Example VIII, l-(3-nitrophenoxy) 2-hydroxy-3-isopropylamino-propane was reacted with Raney-nickel/H to obtain 1-(3-aminophenoxy)-2-hydroxy-3-isopropylamino-propane having a melting point of 91-92 C.

EXAMPLE XXII Preparation of 1-(4-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane.HCl

Using the procedure of Example II, 1 (4 cyanophenoxy)-2,3-epoxy-propane was reacted with isopropylamine to form 1 (4-cyanophenoxy)-2-hydroxy-3-isopropyl-aminopropane. Its hydrochloride had a melting point of 157l59 C.

EXAMPLE XXIII Preparation of 1- (Z-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane.HCl

26.2 g. (0.15 mol) of 1-(2-cyanophenoxy)-2,3-epoxypropane were dissolved in ml. of ethanol and then 23.6 g. (0.4 mol) of isopropylamine were added thereto. After the mixture had stood for 10 hours at room temperature, it was heated at reflux for 3 hours. Then, the solvent was distilled off in vacuo, and the residue was taken up in dilute hydrochloric acid and the solution vacuum filtered from the insoluble matter. The aqueous acid phase was made alkaline with sodium hydroxide and the base precipitating in oily form was extracted several times with ether. The ether extracts were combined and dried over sodium sulfate and the ether was distilled off to obtain 26 g. of raw l-(Z-cyanophenoxy)-2-l1ydroxy- 3-isopropylamino-propane. The product obtained was recrystallized from acetic acid ester with an addition of petroleum ether. The precipitate was dissolved in alcohol, admixed with ethereal HCl and the precipitating crystalline hydrochloride was filtered 01f. The melting point of the hydrochloride was l33l35 C.

EXAMPLE XXIIIa Preparation of -1-( Z-cyanophenoxy)-2-hydroxy-3- isopropylamino-propane.HCl

23.4 g. (0.01 mol) of racernic 1-(2-cyanophenoxy)-2- hydroxy-3-isopropylaminopropane obtained according to Example XXIII are dissolved in 125 ml. of methanol, a solution of 38.6 g. (0.1 mol) of ()-di-0,0-p-toluyl-tartaric acid in 125 ml. of methanol is added and allowed to rest at 20 C. for several days. Then the crystalline portions are sucked off. The filtrate is mixed with 125 ml. of water and is allowed to rest again. Big crystals separate slowly which are finally isolated. They melt at 164166 C. and their specific rotation is [a] -=-10O C. g. of di0,0-p-toluyltartrate are shaken vigorously with 100 ml. of ether and 50 ml. of 1 N sodium hydroxide solution and the ether is separated. The organic phase is washed neutral with H 0 and dried over MgSO The ether is filtered oil? and etheric HCl is added to the filtrate. The precipitating crystallization is recrystallized from ethanol under addition of ether. Melting point of the hydrochloride was 131- 133 C. and its specific rotation was [a] -=28.l. The yield was 1.5 g.

EXAMPLE XXIV Preparation of 1-(3-cyanophenoxy) -2-hydroxy-3-isopropylamino-propane.maleinate Using the procedure of Example XXIII, 1-(3-cyanophenoxy)-2,3-epoxy-propane was reacted with isopropylamine to obtain 1-(B-cyanophenoxy)-2-hydroxy-3-isopropylaminopropane. Its maleinate had a melting point of 88 to 92 C.

EXAMPLE XXV Preparation of 1-(2-methyl-5-aminophenoxy)-2-hydroxy- 3-isopropylamino-propane.2HC1

13.4 g. (0.05 mol) of l-(2-methyl-5-nitrophenoxy)-2- hydroxy-3-isopropylamino-propane were dissolved in 150 ml. of methanol and hydrogenated over Raney-nickel at room temperature and at atmospheric pressure. After the catalyst had been separated, the solvent was distilled in vacuo. The oily residue (8.6 g.=72% of theory) was dissolved in a small amount of methanol and admixed with ethereal hydrochloric acid. Then, the dihydrochloride salt precipitating in crystalline form was vacuum filtered and recrystallized from methanol with an addition of ether to obtain 10.7 g. (68.5% of theory) of 1-(2-methyl-5-aminophenoxy)-2-hydroxy-3-isopropylamino-propane dihydrochloride having a melting point of 240-241 C.

EXAMPLE XXVI Preparation of l- (2-methyl-4-cyanophenoxy)2-hydroXy- 3-isopropylamino-propane.HCl

26.4 g. (0.14 mol) of 1-(2-methyl-4-cyanophenoxy)- 2,3-epoxy-propane were dissolved in 200 ml. of ethanol, and after an addition of 26.6 g. (0.45 mol) of isopropylamine, the mixture was allowed to stand overnight at room temperature. Then, the mixture was first heated at about 60 C. for 2 hours and then it was heated at reflux for 1 hour, after which the solvent was distilled oil in vacuo. The remaining residue was dissolved in dilute hydrochloric acid and was extracted with ether. The aqueous phase was separated and made alkaline with sodium hydroxide. The base precipitating in solid form was isolated and recrystallized from a mixture of ethyl acetate and petroleum ether. The base thus purified was dissolved in ethanol and admixed with ethereal hydrochloric acid to obtain 12.5 g. of 1-(2-methyl-4-cyanophenoxy)-2-hydroxy-3-isopropylamino-propane hydrochloride in the form of a crystalline product having a melting point of 162-164 C.

EXAMPLE XXVII Preparation of 1-(2-chloro-4-aminophenoxy)-2-hydroxy- 3-isopropylamino-propane.2HCl

7.25 g. (0.025 mol) of 1-(2-chloro-4-nitrophenoxy)-2- hydroxy-3-isopropylamino-propane were dissolved in 100 ml. of methanol and hydrogenated under atmospheric pressure and at room temperature with hydrogen and a Raney-nickel catalyst. After the catalyst had been removed, the solvent was distilled ofi in vacuo and the residue was dissolved in a small amount of methanol and admixed with ethereal hydrochloric acid. The crystalline precipitate was vaccum filtered and recrystallized from methanol/ether to obtain 4.5 g. (51% of theory) of l-(2- chloro-4-aminophenoxy)-2-hydroxy 3 isopropylaminopropane dihydrochloride having a melting point of 210- 212 C.

EXAMPLE XXVHI Preparation of 1-(3-methyl-4-aminophenoxy)-2-hydroxy- 3-isopropylamino-propane.2HCl

6.7 g. (0.025 mol) of 1-(3-methyl-4-nitrophenoxy)-2- hydroxy-3-isopropylamino-propane were dissolved in 70 ml. of ethanol and hydrogenated with a Raney-nickel catalyst at room temperature under atmospheric pressure. After the catalyst had been removed, the solvent was distilled off in vacuo and the solid residue was recrystallized from a mixture of ethyl acetate and petroleum ether. The crystalline base was vacuum filtered and dissolved in a small amount of methanol. Then, ethereal hydrochloric acid was added thereto and the crystals formed were isolated and dried to obtain 4 g. of 1-(3-methyl-4-aminophenoxy)-2-hydroxy-3-isopropylamino propane dihydrochloride having a melting point of 248-251 C EXAMPLE XXIX Preparation of 1-(2-methyl-5-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane.HCl

21.5 g. (0.114 mol) of 1-(Z-methyl-S-cyanophenoxy)- 2,3-epoxy-propane were dissolved in 200 ml. of methanol and then, 23.6 g. (0.4 mol) of isopropylamine were added thereto. After the mixture had stood for 1 hour at room temperature, it was heated at reflux for 2.5 hours. Then, the solvent was distilled off in vacuo, and the solid residue was recrystallized from ethyl acetate by an addition of petroleum ether (boiling point=40 C.). The colorless crystalline base was dissolved in methanol, ethereal hydrochloric acid was added and after an addition of absolute ether, 12.5 g. of the crystalline 1-(2-methyl-5- cyanophenoxy)-2-hydroxy 3 isopropylamino)-propane hydrochloride having a melting point of 165168 C were obtained.

EXAMPLE XXX Preparation of 1-(2-amino-4-chlorophenoxy)-2-hydroxy- 3-isopr0pylamino-propane.2HCl

6.4 g. (0.22 mol) of 1-(2-nitro-4-chlorophenoxy)-2- hydroxy-3-isopropylamino-propane were dissolved in ml. of methanol and hydrogenated over Raney-nickel at atmospheric pressure and at room temperature. After the Raney-nickel had been vacuum filtered off, the methanol was distilled off in vacuo. The residue was dissolved in methanol, acidified with ethereal hydrochloric acid and a small amount of ether was added thereto to obtain 5.3 g. of 1-(2-amino-4-chlorophenoxy) 2 hydroxy-3-isopropylamino-propane dihydrochloride having a melting point of 243247 C.

EXAMPLE XXXI Preparation of 1-(2-cyano-3-methylphenoxy) -2-hydroxy- 3-isopropylamino-propane.HC1

Using the procedure of Example XXX, 1-(2-cyano-3- methylphenoxy)-2,3-epoxy-propane in ethanol was reacted with isopropylamine to obtain 1-(2-cyano-3-methylphenoxy)-2-hydroxy-3-isopropylamino-propane. Its hydrochloride had a melting point of 173176 C.

EXAMPLE XXXII Preparation of 1-(3-amino-4-methylphenoxy)-2-hydroxy- 3-isopropylamino-propane.2HCl

Using the procedure of Example XXVIII, 1-(3-nitr0-4- methylphenoxy)-2-hydroxy 3 isopropylamino-propane was hydrogenated in ethanol with a Raney-niekel catalyst to obtain 1- 3-amino-4-methylphenoxy) -2-hydroxy-3-isopropylaminopropane. Its dihydrochloride had a melting point of 216218 C.

EXAMPLE XXXIII Preparation of 1-(2-chloro-4-cyanophenoxy) -2-hydroxy- 3-isopropylamino-propane.HCl Using the procedure of Example XXX, 1-(2-chloro-4 cyanophcnoxy)-2,3-epoxy-propane was reacted with isopropylamine to obtain 1-(2-chloro-4-cyanophenoxy)-2- hydroxy-3-isopropylamino-propane. Its hydrochloride had a melting point of 134-136" C.

EXAMPLE XXXIV Preparation of 1-(3-cyano-4-methylphenoxy)-2-hydroxy 3-isopropylamino-propane.HCl

Using the procedure of Example XXX, 1-(3-cyano-4- methylphenoxy)-2,3-epoxy-propane was reacted with isopropylamine to obtain 1-(3-cyano-4-methy1phenoxy)-2- hydroxy-3-isopropylamino-propane. Its hydrochloride had a melting point of l60162 C.

EXAMPLE XXXV Preparation of 1-(3-methyl-5-cyanophenoxy)-2-hydroxy- 3-isopropylamino-propane.HCl Using the procedure of Example XXX, 1-(3-methyl-5- cyanophenoxy)-2,3-epoxy-propane was reacted with isopropylamine in ethanol to obtain 1-(3-methyl-5-cyanophenoxy)-2-hydroxy-3-isopropylamino-propane.

EXAMPLE XXXVI Preparation of 1- (2,4-dichloro-3-aminophenoxy)-2- hydroxy-3-isopropylamino-propane.ZHCl

Using the procedure of Example XXVIII, 1-(2,4-dichloro 3 nitrophenoxy)-2-hydroxy-3-isopropylaminopropane was hydrogenated in methanol with a Raneynickel catalyst to obtain 1-(2,4-dichloro-3-arnino-phenoxy)-2-hydroxy-3-isopropylamino-propane whose dihydrochloride had a melting point of 130133 C.

The starting material was prepared by reacting 2,4-dichloro3-nitrophenol with epichlorohydrin and reacting the 1-(2,4 dichloro-3-nitrophenoxy)-2,3-epoxypropane thus obtained with isopropylamine.

EXAMPLE XXXVII Preparation of 1-(3-methyl-4-aminophenoxy)-2-hydroxy- 3-isopropylamino-pr0pane.ZHCl

2.64 g. (0.01 mol) of 3-isopropyl-5-(3-methyl-4-aminophenoxyrnthyl)-oxazolidinone (2) were heated under reflux for 3 hours in a mixture consisting of 15 ml. ethanol, 5 ml. water and.2.8 g. (0.05 mol) KOH while stirring. After distilling off the ethanol, the solidifying residue was separated from the aqueous mixture and washed with water. The dry crystallization product was dissolved in methanol and mixed with HCl in ether. The hydrochloride precipitating was again recrystallized as above to obtain 1.95 g. (62.5% yield) of the dihydrochloride melting at 245 C.

The starting material may be prepared analogous to methods described in British Pat. 894,198.

EXAMPLE XXXVIII Preparation of 1-(2-methoxy-4 aminophenoxy)-2- hydroxy-3-isopropylamino-propane oxalate Using the procedure of Example XXVIII, 1-(2-rnethoxy-4-nitro-phenoxy) 2 hydroxy 3 isopropylamine was hydrogenated in methanol with a Raney-nickel catalyst to obtain 1-(2-methoxy-4-aminophenoxy)-2-hydroxy 3- isopropylaminopropane. The oxalate was obtained by adding oxalic acid in ether to a solution of the base in methanol and it had a melting point of 146147 C.

The starting material was obtained by reacting-Z-methoxy-4-nitrophenol with epichlorohydrin and reacting the 1-(2-n1ethoxy 4 nitrophenoxy)-2,3-epoxypropane thus obtained with isopropylamine.

1 2 EXAMPLE XXXIX Preparation of 1-(3-amino-4-methoxyphenoxy)-2-hydroxy-3-isopropylamino-propane.2HCl

Using the procedure of Example XXVIII, 1-(3-nitro-4- methoxyphenoxy) 2 hydroxy 3 isopropylamino-propane was hydrogenated in methanol with a Raney-nickel catalyst to obtain 1-(3-amino-4-methoxyphenoxy)-2hydroxy-3-isopropylamino-propane. The dihydrochloride was obtained by adding HCl in ether to a solution of the base in methanol and had a melting point of 215-2l7 C.

The starting material was obtained by reacting 3-nitro- 4-methoxyphenol with epichlorohydrin and reacting the resulting epoxide with isopropylamine.

EXAMPLE XL Preparation of 1-(2-aminomethylphenoxy)-2-hydroxy- 3-isopropylamino-propane.2HC1

26.2 g. (0.15 mol) of 1-(Z-cyanophenoxy)-2,3-epoxypropane (prepared by reacting 2-cyano-phenol with epichlorohydrin in the presence of NaOH) were dissolved in 150 ml. of ethanol and then 23.6 g. (0.4 mol) of isopropylamine were added thereto. After the mixture had stood for 10 hours at room temperature, it was heated at reflux for 3 hours. Then, the solvent was distilled 01f in vacuo, and the residue was taken up in dilute hydrochloric acid and the solution vacuum filtered from the insoluble matter. The aqueous acid phase was made alkaline with sodium hydroxide and the base precipitating in oily form was extracted several times with ether. The ether extracts were combined and dried over sodium sulfate and the ether was distilled oif to obtain 26 g. of raw 1-(2-cyanophenoxy)-2-hydroxy3-isopropylaminopropane. The product obtained was recrystallized from ethyl acetate with an addition of petroleum ether. The hydrochloride of the base thus obtained had a melting point of C.

Step B: Preparation of 1-(2-aminomethylphenoxy)-2- hydroxy-3-isopropylaminopropane.2HCl

22.2 g. (0.095 mol) of 1-(Z-cyanophenoxy)-2-hydroxy- 3-isopropylaminopropane were dissolved in 200 ml. of methanol. Ammonia was added thereto and the mixture was hydrogenated over Raney-nickel at a hydrogen pressure of 21 atmospheres at 20 C. After filtering oif the catalyst, the solvent was distilled off in vacuo and the oily residue was dissolved in ethanol and acidified with ethanolic HCl. The solution was filtered hot and then cooled to obtain 17.4 g. of the 1-(Z-amino-methylphenoxy)-2- hydroxy-3-isopropylamino-propane dihydrochloride having a melting point of 176-179 C.

The compounds according to the present invention, that is, those embraced by Formulas I and Ia above and their non-toxic, pharmacologically acceptable acid addition salts, have useful pharmacodynamic properties. More particularly, they produce bradycardia and at the same time act as N-isopropyl-noradrenaline (isoproterenol) antagonists. Thus, the tachycardiac effects caused by the administration of N-isopropyl-noradrenaline are suppressed or eliminated by prior administration of one of the compounds of the present invention, and cardiac arrhythmia are equalized by them. In other Words, the compounds according to the present invention block the sympathetic nervous system of the heart, which has heretofore not been possible with chemotherapeutic agents. Consequent ly, the areas of indication for the compounds of the present invention are hypertension, angina pectoris, cardiac arrhythmia, digitalis intoxication and pheochromocytoma disorders.

In view of the presence of an asymmetric carbon atom in the 2-position of the propylene chain, the compounds of the present invention exists not only in the form of racemic mixtures but also in the form of optical antipodes. The optical antipodes may be separated from the racemates by conventional methods and have the same pharmocodynamic properties as the racemates.

The novel method of the invention for inducing bradycardia in warm-blooded animals while suppressing tachycardiac effects of N-isopropyl-noradrenaline comprises administering to worm-blooded animals a safe and effective amount of at least one compound of Formula I or II.

In warm-blooded animals, the compounds of the present invention are administered perorally or parenterally as active ingredients in conventional dosage unit compositions, that is, compositions in dosage unit form consisting essentially of a major amount of an inert pharmaceutical carrier and one dosage unit of the active ingredient. Dosages of the compounds pursuant to the present invention are from 0.01 to mgm./kg., depending upon the route of administration and the intensity of the effect desired or required. Thus, for oral administration the dosage range is 0.4-5 mgm./kg., preferably 13 mgm./ kg.; for intravenous administration it is 0.01-0.2 mgm./ kg., preferably 0.020.1 mgm./kg.; and for subcutaneous administration it is 0.021.0 mgm./kg., preferably 0.1-0.3 mgm./kg. Typical examples of dosage compositions are tablets, coated pills, suspensions, solutions, suppositories and the like.

PHARMACEUTICAL EXAMPLES Example A 40.0 g. of racemic 1-(2-cyanophenoxy)-2-hydroxy-3- isopropylamino-propane hydrochloride, 16.40 g. of corn starch, 240.0 g. of calcium phosphate and 1.0 g. of magnesium stearate were thoroughly admixed and then granulated in the conventional manner. The granulate was then presesd into 1,000 tablets Weighing 445 mg. each and containing 40 mg. of the active ingredient.

Example B 250.0 g. of ()-1-(2-cyanophenoxy)-2-hydroxy-3-isopropylamino-propane hydrochloride and 175 g. of corn starch were thoroughly admixed. The mixture was then used to fill gelatin capsules with 200 mg. of the mixture. Each capsule contained 25 mg. of the optically active ingredient.

Example C 2.5 parts by weight of racemic 1-(2-cyano-3-methylphenoxy)-2-hydroxy 3 isopropylamino-propane hydrochloride and 0.2 part by weight of sodium salt of ethylene diamine tetraacetic acid were dissolved in distilled water and the volume was adjusted to 100 parts. The solution was filtered until free from suspended particles and filled into 1 cc. ampoules under aseptic condition. The ampoules were sterilized and sealed. Each ampoule contained 25 mg. of the active ingredient.

Example D 25.0 g. of racemic 1-(2-a1lyl-4-cyanophenoxy)-2-hydroxy-3-isopropylamino-propane maleinate, 295.0 g. of carboxymethyl cellulose and 20.0 g. of stearic acid were thoroughly admixed and the mixture was granulated using a solution of 40.0 g. of cellulose acetate phthalate in 200 ml. of an ethanol and ethyl acetate mixture. The granulate was then pressed into cones weighing 380 mg. which were coated with a sugary 5% solution of polyvinyl-pyrrolidone in water in the usual fashion. Each coated pill contained 25 mg. of active ingredient.

Example E 50.0 g. of 1-(4-cyanomethylphenoxy)-2-hydroxy-3-isopropylamino-propane sulfate, 16.40 g. of lactose, 194.0 g. of corn starch, 14.0 g. of colloidal silicic acid and 6.0 g. of polyvinyl pyrrolidone were thoroughly admixed and the mixture was granulated with an aqueous solution containing g. of soluble starch in the usual manner. The granulate was admixed with 2.0 g. of magnesium stearate and pressed into 440 mg. tablets containing 50 mg. of the active ingredient.

l 4 Example F 40.0 g. of racemic 1-(2-aminophenoxy)-2-hydroxy-3- isopropyla-mino-propane hydrochloride, 16.40 g. of corn starch, 240.0 g. of calcium phosphate and 1.0 g. of magnesium stearate were thoroughly admixed and then granulated in the conventional manner. The granulate was then pressed into 1,000 tablets weighing 445 mg. each and containing 40 mg. of the active ingredient.

Example G 25.0 g. of ()-1-(Z-aminophenoxy)-2-hydroxy-3-isoproplyamino-propane hydrochloride and 175 g. of corn starch were thoroughly admixed. The mixture was then used to fill gelatin capsules with 200 mg. of the mixture. Each capsule contained 25 mg. of the optically active ingredient.

Example H 2.5 parts by weight of racemic 1-(3-amino-4-methylphenoxy)-2-hydroxy 3 isopropylamino-propane hydrochloride and 0.2 part by weight of sodium salt of ethylene diamine tetracetic acid were dissolved in distilled water and the volume was adjusted to parts. The solution was filtered until free from suspended particles and filled into 1 cc. ampoules under aseptic condition. The am poules were sterilized and sealed. Each ampoule contained 25 mg. of the active ingredient.

Example I 25.0 g. of racemic 1-(Z-amino-S-rnethoxyphenoxy) 2- hydroxy-3-isopropylamino-propane maleinate, 295.0 g. of carboxymethyl cellulose and 20.0 g. of stearic acid were thoroughly admixed and the mixture was granulated using a solution of 40.0 g. of cellulose acetatephthalate in 200 ml. of an ethanol and ethyl acetate mixture. The granulate was then pressed into cones Weighing 380 mg. which Were coated with a sugary 5% solution of polyvinylpyrrolidone in water in the usual fashion. Each coated pill contained 25 mg. of active ingredient.

Example I 50.0 g. of 1-(4-aminomethylphenoxy)-2-hydroxy-3-iso propylamino-propane sulfate, 16.40 g. of lactose, 194.0 g. of corn starch, 14.0 g. of colloidal silicic acid and 6.0 g. of polyvinylpyrrolidone were thoroughly admixed and the mixture was granulated with an aqueous solution containing 10 g. of soluble starch in the usual manner. The granulate was admixed with 2.0 g. of magnesium stearate and pressed into 440 mg. tablets containing 50 mg. of the active ingredient.

Although the above illustrative dosage unit compositions comprise only a few of the compounds of the present invention as an active ingredient, it should be understood that any of the other compounds embraced by For mula I or a non-toxic acid addition salt thereof, either in the racemic or in the optically active dor lform, may be substituted therefore in Examples A to E. Moreover, the amounts of the active ingredient in the illustrative examples may be varied within the indicated limits to meet particular requirements, as may the amounts and nature of the inert ingredients.

PHARMACOLOGICAL DATA The compounds were tested for fl-adrenergic blocking activity in adult laboratory guinea pigs under urethane anesthesia.

The bradycardia activity of the compounds was determined by administering the test compounds by intravenous injection at 5 progressively increasing dosages (0.1 mg./kg., 0.3 mg./kg., 1 mg./-kg., 3 ing/kg. and 10 mg./ kg. for each compound) to 4 animals per compound and ascertaining the decrease of the basic frequency of the heart beat by means of an electrical recorder.

After each determination of the decrease of the basic frequency, 1 'y/kg. of isoproterenol [:u (isopropyl- 15 aminomethyl) protocatechuyl alcohol] was administered to the same animal by intravenous injection, and the maximum frequency change was determined.

The results of both determinations (bradycardia activity and isoproterenol antagonistic activity) were plotted as a dose activity curve, and the curve for each compound was compared with a corresponding curve for the standard control compound dichloroisoproterenol (DCI), a known effective ,B-adrenergic blocking agent. The following results were obtained.

Various modifications of the compositions and method of the invention may be made without departing from the spirit or scope thereof and it is to be understood that the invention is to be limited only as defined in the appended claims.

We claim:

'1. A composition having bradycardia activity and N- isopropyl-noradrenaline antagonistic activity comprising an efiective amount of an active compound selected from the group consisting of racemic l-substituted phenoxy-2- hydroxy-3-isopropylamino propanes of the formula wherein R is selected from the group consisting of hydrogen, halogen, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, R is -(CI-I NH where x is an integer from to 1 and R is selected from the group consisting of hydrogen and halogen, their optically active isomers and non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers and a major amount of a pharmaceutical carrier.

2. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1-(4 amino-phenoxy)-2-hydroxy-3-isopropylamino-propane, its optically active isomers and the non-toxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

3. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1 (2-amino-S-methoxy-phenoxy)-2-hydroxy-3-isopropylamino-propane, its optically active isomers and nontoxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

4. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1-(3 amino-phenoxy)-2-hydroxy-3-isopropylamino-propane, its optically active isomers and the non-toxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

5. The composition of claim 1 wherein the active compound is selected from the group consisting of racemic 1-(2 chloro 5 aminophenoxy)-2-hydroxy-3-isopropylamino-propane, its optically active isomers and the non- 16 toxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

6. The composition of claim 1 wherein the active compound is selected from the group consisting of racemic 1-(2 amino-phenoxy)-2-hydroxy3-isopropylamino-propane, its optically active isomers and the non-toxic, pharmaceutically acceptable acid addition salts of said raccmate and optically active isomers.

7. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1-(2-methyl 5 amino-phenoxy)2-hydroxy-3-isopropyl amino-propane, its optically active isomers and the nontoxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

8. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1-(2-chloro 4 amino-phenoxy)-2-hydroxy-3-isopropylamino-propane, its optically active isomers and the nontoxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

9. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1-(3-methyl 4 amino-ph'enoxy)-2-hydroxy-3-isopropylamino-propane, its optically active isomers and the nontoxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

10. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1 (2-amino-4-chloro-phenoxy)2-hydroxy-3-isopropylamino-propane, its optically active isomers and the non-toxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

'11. The composition of claim 1, wherein the active compound is selected from the group consisting of racemic 1 (3-amino-4-rnethyl-phenoxy)-2-hydroxy-3-isopropylamino-propane, its optically active isomers and the non-toxic, pharmaceutically acceptable acid addition salts of said racemate and optically active isomers.

12. A method of inducing bradycardia and suppressing tachycardiac effects of N isopropyl noradrenaline in warm-blooded animals which comprises administering to warm-blooded animals an amount sufficient to induce bradycardia and suppress tachycardiac elfects of N-isopropyl-noradrenaline of a compound selected from the group consisting of racemic l-substituted phenoxy-Z-hydroxy-3-isopropylamino propanes of the formula wherein R is selected from the group consisting of hydrogen, halogen, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, R; is (CH NH where x is an integer from 0 to 1 and R is selected from the group consisting of hydrogen and halogen, their optically active isomers and non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers.

References Cited UNITED STATES PATENTS 3,542,872 11/1970 Koppe et al. 260570.7

ALBERT T. MEYERS, Primary Examiner L. SCHENKMAN, Assistant Examiner US. Cl. X.R. 424282, 304 

